Limit ECS and PhpStan versions

Newer versions causing errors:

ECS >= 8.3: PHP Fatal error:  Uncaught OutOfBoundsException: Package "symplify/easy-coding-standard" is not installed in phar:///home/youwe/Projects/webgriffe-esb/vendor/phpstan/phpstan/phpstan.phar/vendor/composer/InstalledVersions.php:1081

PhpStan >= 0.12.67:  Ignored error pattern /Unable to resolve the template type .*? in call to function Amp\\call/ was not matched in reported errors. Ignored error pattern /Unable to resolve the template type .*? in instantiation of class Amp\\Producer/ was not matched in reported errors.

composer.json

@@ -56,8 +56,8 @@
         "pda/pheanstalk": "^3.1",
         "mikey179/vfsstream": "^1.6",
         "amphp/artax": "^3.0",
-        "phpstan/phpstan": "^0.12",
-        "symplify/easy-coding-standard-prefixed": "^8.1"
+        "phpstan/phpstan": "^0.12 <=0.12.66",
+        "symplify/easy-coding-standard-prefixed": "^8.1 <8.3"
     },
     "scripts": {
         "phpcs": "phpcs",